For fun, not a diagnosis: turn a score you already have into a percentile using the normal distribution.
Results computed in your browser. For entertainment only.
This page does not ask a single question, time a puzzle, or measure anything about you. It takes a number you already have, however you got it, an old school test, an online quiz, a joke result from a friend, and runs it through the same statistical curve real IQ tests are scored on. That is a conversion, not an assessment. If you have never taken a real IQ test, this tool has nothing to tell you about your actual cognitive ability, because it never asked you to demonstrate any.
The labels below are a widely used, informal shorthand, not an official diagnostic category from any single publisher. Different test makers use different words and different score cutoffs for roughly the same range, and this tool's boundaries are one common version among several, picked for round numbers rather than a specific published standard:
Say so plainly: these bands are arbitrary round-number cutoffs picked for this calculator, not a clinical scale. A real evaluation would come with its own publisher-specific classification table, and that table is the one that actually matters.
IQ scores are built to follow a normal distribution around a mean, usually 100, with a set standard deviation, usually 15. This calculator computes how many standard deviations your entered score sits from the mean, then reads the corresponding position on that bell curve to get a percentile. A score exactly at the mean lands at the 50th percentile by definition; a score one full standard deviation above it, 115 on the default settings, lands around the 84th.
Worked example. A score of 120 with a mean of 100 and a standard deviation of 15 is 20 divided by 15, or 1.33 standard deviations above the mean. Reading that position on the normal curve gives roughly the 90.9th percentile, meaning the score sits above about 91 percent of a population with this mean and spread, and below about 1 in 11 people at the same time.
Change the standard deviation and the same raw score produces a different percentile, since a wider spread pulls every score closer to average in percentile terms. This calculator has no way to know which specific test, if any, produced the number you entered, and it cannot correct for test-specific quirks like the Flynn effect or a publisher's own norm updates. Use it to satisfy curiosity about a number you already have, not to draw conclusions about anyone's actual ability.
No. It does not ask you a single question or measure anything about you. It only converts a score you already have, from wherever you got it, into a percentile using a standard statistical curve. Treat it as entertainment, not an assessment.
Because they are. Terms like average or superior are a loose, commonly used shorthand for score ranges, not an official diagnostic category from any single test publisher. Different publishers use different labels and different cutoffs for the same score.
A licensed psychologist administers recognized instruments like the Wechsler scales under controlled, proctored conditions. That is a meaningfully different process from typing a number into a free web tool, and it is the only route to a score with any clinical standing.
The standard deviation sets how spread out scores are around the average. A wider standard deviation means the same raw score sits closer to the middle of the distribution, which produces a lower percentile than a narrower one would for that identical score.